#login-bg {
    background:url(/images/loginbg.jpg)no-repeat;  
}

#login-center {
    margin:0 auto;
    width:250px;
    height:200px;
    border:1px solid #F00;
    text-align:center;
    position: absolute; 
    left:50%;
    top:50%; 
    transform: translateX(-50%) translateY(-50%);
}

#login-bottom {
    margin:0 auto;
    width:100%;
    height:30px;
    text-align:center;
    position: absolute; 
    bottom:30px; 
}